Wrist blaster
From Wookieepedia, the Star Wars wiki.
A wrist blaster was a blaster that went onto a wrist. This variant of the typical blaster was much easier to conceal, as it was smaller and less obvious, yet easier to withdraw than a holdout blaster. This weapon was incorporated into the armament of the B2 super battle droid and the B3 ultra battle droid. Another known user of it was Legacy era Sith Lord Darth Nihl, who used it in conjunction with his lightsaber staff, making him a deadly foe.
